J-cup roller
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Roller J-Cups – Pair

Our exclusive Roller J-Cups allow for easy bar placement adjusting.

Fits 2.3″ x 2.3″ uprights with 5/8″ holes only.


In Stock





Easily adjust the position of your bar with these
one-of-a-kind Roller J-Cups.

The unique and extraordinarily useful design of these exclusive Roller J-Cups allows you to quickly and easily adjust the position of your barbell. To learn more, check out Bells of Steel J-Cups: What’s the Difference?

Specs Per J-Cup

Outer CoatingBlack Powder Coat
Roller MaterialHard Nylon
Max Capacity136kg/300lbs
Shipping Box Dimensions7" x 7" x 7"
WarrantyLimited Lifetime Warranty

IMPORTANT: The J-Cups ONLY fit upright tubing dimensions of 2.3” x 2.3” (60mm x 60mm) with 5/8” holes — our standard Bells of Steel upright size.

Frequently Asked Questions

Each Roller J-Cup has a 158mm/6.22″ height, 65mm/2.56″ width, and 165mm/6.49″ total length (depth).

Each Roller J-Cup weighs 1.1kg/2.5lbs, for a combined weight of 2.2kg/5lbs.

The roller material is hard nylon, with a black powder coat on the outside of the Roller J-Cups.

Each Roller J-Cup has a 136kg/300lb static capacity, for a 272kg/600lb total weight capacity.

No, it’s very unlikely that they will fit. The Roller J-Cups are designed to fit perfectly to fit our racks with 2.3” x 2.3″ / 60mm x 60 mm and 5/8” holes.

No, the Roller J-Cups currently do not have any inner lining. To avoid premature wearing of your barbell, ensure it is centered on the roller prior to adjusting the bar to the left or right.

Yes, each Roller J-Cup has a distinct right or left side and they will look symmetrical when mounted.

In the box, you’ll find the following pieces: two (2) Roller J-Cups.

No tools are needed, as there is no assembly required.

Covered under our Limited Lifetime Warranty guarantees that the Roller J-Cups will not break under normal use, and protects against defects in material, function and workmanship.

Customer Reviews
4.8 Based on 12 Reviews
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Michael S.
United States United States

Need Roller J hooks for Titan X2 rack

Needed or more so wanted, roller j hooks for my titan X2 rack. These are close in size that I took a gamble and bought them. Not disappointed at all. These seem really durable. The rollers are very smooth. They make centering the bar so much easier now. I mostly use a 32 mm rogue squat bar and anything over 225 the bar would not shift to either side very easily. They save time and most importantly energy when re-centering the bar. At 300+, I would have to pick the bar up and shift it over on the stock j hooks, NOT ANYMORE. These make life so much simpler. Roller j hooks should just come stock with all racks from everyone. SO to get these to fit the X2 rack, I used a 2 part epoxy and glued - 1/8" thick UHMW plastic on the insides of the j hooks. Its not the prettiest looking but I was short on time and I don't care about how they look on the inside...I have attached photos for a reference. On a side note, B.O.S. contacted me before they shipped this out as to as ask if these will fit my rack cause there was no record of me owning a B.O.S. rack. thought it was strange but ok. Delayed shipping by about 2 days just to confirm these would fit. I knew the pin would fit an just had to do some math on the plastic inserts.

  • My Fitness Goal Is: Keep from feeling old
Bells of Steel Roller J-Cups - Pair ReviewBells of Steel Roller J-Cups - Pair ReviewBells of Steel Roller J-Cups - Pair ReviewBells of Steel Roller J-Cups - Pair ReviewBells of Steel Roller J-Cups - Pair Review

Bells of Steel

We're excited you love your Roller J Cups! We're even more excited you were able to "adjust" them to make them fit for you. We like to confirm with customers that don't have our racks to make sure the attachment they purchased fits their rack prior to shipping. Thanks for the review, now back to the gainz! Erica and the B.o.S Crew!

Eric N.


Can't get this anywhere else let alone for the price. Great quality, use it on my lever arms to simulate a assisted lifted off without a partner in benching. Only suggestion is to add uhmw plastic. Great company to buy from

  • My Fitness Goal Is: Avoiding dad bod with no kids
Bells of Steel Roller J-Cups - Pair Review
Steve C.
Canada Canada

Really nice for bench

I think it's unreal that these come standard with the light commercial rack. They're so useful for adjusting the bar position before a big bench. My only complaint is that I don't understand why they don't have UHMW coating like the regular J-cups. It's an easy DIY fix though, so they're still well worth picking up if you don't have any. I bought a cheap sheet of 1/8" UHMW off amazon, cut a few strips and used 2 sided gorilla tape to cover all the metal spots and protect the knurling on my beautiful Bells of Steel cerakote power bar 🙂

  • My Fitness Goal Is: Strength, size, general fitness health
  • Bells of Steel Products Owned: Just about everything!
  • Product Condition: Perfect
Bells of Steel Roller J-Cups - Pair Review
Jason R.

Makes bench setup easy

Love using these for bench. I never quite get my bench centered perfect under the rack. and this lets me adjust with ease when fully loaded.

  • My Fitness Goal Is: He-Man
  • Bells of Steel Products Owned: Squat Stand
  • Product Condition: Perfect
brian m.

Let the Good Times Roll!

These roller J-cups make so much sense. Bench press, incline press, squats all require a centered bar. It's so easy with these j-cups that I believe they should be standard equipment. I LOVE them!

  • My Fitness Goal Is: More muscle, less fat, less old man.
  • Bells of Steel Products Owned: Roller J cups for now.
  • Product Condition: Perfect

Bells of Steel

Hey there Brian, Thanks for the awesome review. The Roller J-Cups do make it SO easy to center your bar! Let the good times roll, indeed! Thanks again, and happy lifting! Kat and the B.o.S. Crew